Question
Download Solution PDFSecond stage Bio-chemical oxygen demand in waste water is also known as:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Biochemical oxygen demand (B.O.D.): It is the amount of dissolved oxygen needed by aerobic biological organisms in a body of water or wastewater sample to break down organic material present in a given water or wastewater sample at certain temperature (20˚C) over a specific time period (5 days).
The carbonaceous stage (First stage): It represents that portion of oxygen demand involved in the conversion of organic carbon to carbon dioxide.
The nitrogenous stage (Second stage):It represents a combined carbonaceous plus nitrogenous demand, when organic nitrogen, ammonia, and nitrite are converted to nitrate.
Nitrogenous oxygen demand generally begins after 5th day.
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